CN107618090B

CN107618090B - Method for manufacturing a wood material board

Info

Publication number: CN107618090B
Application number: CN201710573749.9A
Authority: CN
Inventors: J·雅施克; B·雷胡伊斯; R·克伦巴赫-福斯; M·韦森
Original assignee: Siempelkamp Machine And Complete Sets Equipment Co Ltd
Current assignee: Siempelkamp Machine And Complete Sets Equipment Co Ltd
Priority date: 2016-07-15
Filing date: 2017-07-14
Publication date: 2019-12-13
Anticipated expiration: 2037-07-14
Also published as: PT3269521T; EP3269521A1; CN107618090A; DE102016008608B3; EP3269521B1; ES2710326T3

Abstract

The invention relates to a method for manufacturing a wood material board, in which the board is passed through the following stations: -a dispensing device (2) with adjustable metering for supplying wood material onto a conveyor belt (4) to form a mat of wood material; -at least one continuous or discontinuous press (6) for pressing the mat of solid wooden material by means of pressure loading; -at least one separating device (7) for separating the compacted mat of wooden material into individual, one-by-one boards; -a measuring station (9.1) for determining plate geometry data; -a cooling or curing warehouse (10) in which the panels are stored under pre-established atmospheric conditions until they are transported towards a final processing station (15) or a delivery point. In order to reduce the expenditure in the final process of the production of wood material boards and to obtain the production precision during the format change, provision is made for: at least one further measurement of the plate geometry is carried out after the curing process in the cooling or curing silo (10), and the setting values for the metering-adjustable distribution device (2) and/or the setting of the press (6) and/or the setting of the separating device (7) are determined and set on the basis of the difference in the measured values.

Description

Method for manufacturing a wood material board

Technical Field

the invention relates to a method for manufacturing a wood material board, in which method the wood material board is manufactured by the following stations:

-a dispensing device with adjustable metering for supplying wood material onto a conveyor belt to form a mat of wood material;

-at least one continuous or discontinuous press for pressing the mat of solid wood material by means of pressure loading;

-at least one separating device for separating the compacted mat of wooden material into individual, one-by-one boards;

-a measuring station for determining plate geometry data;

-a cooling or curing warehouse in which the boards are stored under pre-defined atmospheric conditions until the boards are transported towards a final processing station or a delivery point.

background

the stations are known in the manufacturing process of wood material boards. "wooden material board" refers for example to particle board, OSB board (oriented strand board), lightweight structural board, multilayer board, HDF board (high density fiberboard) or MDF board (medium density fiberboard).

The spreadable material spread onto the conveyor belt, mainly the glued wood chips, is in the following referred to as wood material mat. These mats of wood material may have a thickness of a few millimeters to 1 meter. At present, the spreading stations can be varied both in the transport direction of the conveyor belt and in the transverse direction by means of one or more metering-adjustable spreading stations connected one behind the other. A plurality of successive scattering stations can form different layers, such as cover layers and intermediate layers.

the conveyor belt continues to convey the mat of wood material to the press. In the present invention, the press is usually realized as a double belt press for loading the mat of wood material conveyed in the conveying direction via the conveyor belt by means of pressure and heat. A device so constructed is typically used for two purposes. On the one hand, a dense product is produced from the pressed chips or fibers by means of the device. The invention herein is directed to the manufacture of particle board or fibre board as disclosed by EP 1236552B 1. By means of the pressure and possibly the setting of the spacing, the mat of scattering material is compacted and compacted. On the other hand, heat supply allows the binder to liquefy or evaporate water.

After the press, the produced, relatively densely compacted mat is cut into slabs. These plates are usually measured in terms of geometrical data and, for example, density, in order to intervene directly in the spreading device or press by means of control techniques.

The produced board is then cooled and/or stocked in a known manner until it is treated, e.g. ground, in a final processing station. The manufacturer would of course want less waste to be ground off here. It is desirable that the abrasive removal be used only to flatten the surface quality and not necessarily affect the desired endplate geometry.

But this cannot be achieved with current devices. The boards are stored in a curing warehouse in defined stacks for a certain time after leaving the wooden material plant. During this time, the panel matures and shrinks a certain amount in relation to many edge conditions. These edge conditions include, for example, the air humidity and temperature in the warehouse, but also the position of the individual plates in the stack, since the lower plate is subjected to a significant pressure, while the upper plate is subjected to little load. This means that the thickness of the plates in the stack is actually different.

More difficult, board manufacturers often wish to change the size of the product to be manufactured from time to time. In particular, different plate thicknesses are produced, but the dimensions of length and width may also vary.

Disclosure of Invention

The object of the invention is therefore to reduce the outlay in the final process of the production of wood material boards. The aim of the invention is also to obtain the production accuracy during the format change.

In terms of method, the object is achieved in particular by: at least one further measurement of the plate geometry is carried out after the curing process in the curing silo, and the adjustment values for the metering-adjustable spreading device and/or the setting of the press and/or the setting of the separating device are determined and set by means of the difference in the measured values.

In this way, it is possible to take into account the variations in the geometrical and physical data of the boards that occur during their cooling and/or curing storage for the adjustment parameters in the field of spreading devices, presses and separating devices. "setting of the press" is to be understood in this case as a pressure setting in the press or a temperature setting in the press or a distance setting in the press. These settings may vary in the longitudinal and transverse directions.

it has been shown in tests that the portion of the plate that is still to be ground off or cut off in the final process for completing the plate can be reduced by at least 50%. If there is no feedback measurement after cooling or curing the warehouse, the safety margin for material addition must be set significantly higher at specification changeover.

The amount of spreading on the conveyor belt can now be set precisely to a large extent and predetermined for the current sheet thickness by means of the method according to the invention. The results from the press pressure and press temperature can also be known more accurately

In many cases it is not necessary to set up a second measuring station for the further measurement. In order to record the change of the boards during the cooling or curing storage, in some cases it is only necessary to determine the change value once and to use the same measuring station as in the first measurement. It is thus possible to determine, for the particular specification desired, a much more precise adjustment value for the metering-adjustable distribution device and/or a setting in the press and/or a setting of the separating device. The investment in the measuring device does not have to be increased.

The specific control parameters in the area of the spreading device (e.g. by means of a metering plate or metering wheel), in the area of the pressure application in the press (e.g. by means of a pressure cylinder at the press plate) or in the area of the separating device (e.g. the saw cutting angle) are not described in detail here, since these possibilities are known to the skilled person.

Advantageously, the measured data measured before and after the cooling or curing warehouse are stored in at least one data memory and compared and analyzed by a central computer.

From this, it is known the geometrical changes that occur during cooling or curing storage of a particular specification. The changes may be stored in a data store and used directly when the same specification set is repeated.

Preferably, the central computer is also provided with parameters, i.e. the product type and/or the storage time in the warehouse and/or the ambient temperature and air humidity.

It is also preferred that, in addition to the product type, the central computer also takes into account the relationship with all the defined production parameters and environmental factors in the production area, such as the ambient temperature or the air humidity.

These parameters influence the change of the plate and can therefore be taken into account by the medium-pressure computer when analyzing the control parameters of the spreading device or of the press or of the separating device.

advantageously, the adjustment values are transmitted by the central computer to the spreading device or to the press or to the separating device.

The central computer determines the actual changes that occur to the specific specifications during the cooling or curing storage and can assign the adjustment parameter changes to the spreading device or press or separating device in the fastest way, which minimizes the excess to be ground off or cut off during the production process.

Preferably the labels are supplied to the plates of a cooling or curing warehouse.

the identification makes it possible to unambiguously assign to each plate, with great reliability, the dimensions before and after cooling or curing storage. Identification may be by means of a marking, such as a color marking, a bar code stamp, a number or even an RFID chip. Furthermore, all produced plates can be verified together with the measurement data assigned thereto.

The thickness is preferably measured at the same location on the board before and after cooling or curing storage.

The measurement outlay can be significantly reduced if, for example, the thickness or the difference in thickness during curing is determined exactly at the same point on a plate. But the number of measurement positions depends on different production parameters.

In order to obtain good accuracy over the entire length and width of the plates, it is preferably provided that each plate is placed in a predefined measurement grid in both measurements.

Provision is preferably made for the plates supplied to the cooling and/or curing warehouse to be assigned to the corresponding mat sections in the preceding production process.

In this way, the regulation potential is again greatly increased. If the mat thickness has additionally been determined, for example during a movement after the spreading device, it can then be recognized by the sheet measurement how the spreading device has to be corrected, for example in the transverse profile, in order to make the accuracy of the sheet thickness particularly good in width after passing through the press.

It is particularly advantageous to create a manipulated variable characteristic curve for each specification and/or for each product on the basis of the difference measurement.

These characteristic curves can be stored in a data memory or in a central computer. The throughput of the distribution device or the pressure in the press can be set in advance using the stored characteristic curves and preferably the longitudinal and transverse profile control when the desired format or product is changed over. This significantly reduces the amount of waste that would otherwise be produced during format or product changeover.

Drawings

The invention is explained in detail below with reference to the sole drawing. The figure shows a highly simplified schematic view of an apparatus for manufacturing boards of wood material. The production method according to the invention is explained with the aid of stations.

Detailed Description

the three rows, superimposed one above the other, schematically show the units or stations of the device for manufacturing the sheets 1 of wood material, which are in fact passed in sequence from right to left.

In the upper row is shown a scattering device 2 comprising three scattering stations 3a, 3b, 3 c. The spreading stations 3a and 3c spread the lower and upper covering layers of the mat of wooden material, not shown, onto the conveyor belt 4, and the station 3b spreads the intermediate layer of the mat of wooden material, not shown, onto the conveyor belt 4. The throughput of the spreading material, i.e. the wood material, can be metered by means of the shown spreading rollers and possible guide and closing plates and preferably also can be metered differently in the transverse profile.

In the second row, the mats of wood material spread on the conveyor belt 4 are conveyed via the illustrated false bulk receiver 5 to a continuous double belt press 6. In which a mat of wood material is compacted under pressure and temperature loading into a dense wood material. For the compacting, for example, hydraulic cylinders, not shown in detail, are used, which are arranged in multiple rows in and transversely to the conveying direction and act on the heatable pressure plate. The thickness and density profile can be influenced in the transverse and longitudinal directions by means of these hydraulic cylinders.

Following the double belt press is a separating device 7 in the form of a saw station. Where the pressed wood material is sawn into boards not only in the longitudinal direction but also in the transverse direction. The (circular) saw can be driven to adjust not only its pitch but also its cutting angle. The slab can be accurately set within a range of 1/10 mm. Optionally, an identification station 16, in which the plates can be unambiguously assigned for subsequent purposes, and a plate scale 8 are provided after the separating device 7.

In the third row, the right-hand first measuring station 9.1 is followed, in which at least the geometric data of the board can be detected. This includes length, width and thickness. The detected data are transmitted via the data line 14.1 to the data memory 11.1, stored there and/or transmitted onward to the central computer 12.

The board is then fed into a cooling and/or curing warehouse 10 according to the method of the invention. In storage, the boards are usually stacked one on top of the other, so that the lower boards are subjected to a greater load. The panels may for example have completely different thicknesses after curing.

The geometric data are recorded again after the curing process in a second measurement of the geometric data, which can be carried out at the second measuring station 9.2 with a separate data memory 11.2 or also at the first measuring station 9.1. The identified plate is measured here with the aid of a predefined measurement grid at the same position as in the first measurement process. These data are also transmitted to the central computer via data lines 14.1, 14.2. The measurement data are compared and analyzed in the central computer. In addition, other parameters, such as the type of product and/or the storage time in the warehouse and/or the ambient temperature and air humidity, can also be added to the calculation. The central computer determines the characteristic curve for a specific product or specification and can vary the control parameters for the distribution device 2, the double belt press 6 or the separating device 7 via the control lines 13.1, 13.2, 13.3.

The plates supplied to the curing store can be efficiently allocated to the corresponding mat sections in the preceding production process. This means that the plates located below in the stack and above in the stack can already be spread or compacted differently during the production process. This generally results, for example, in all plates having a predefined, identical thickness.

All these measures result in that the grinding device 15 does not have to be ground again to a significant excess in the final processing station. But only the surface is flattened, since the geometry of the plate has been set very precisely in advance by means of the method according to the invention.

List of reference numerals

Device for producing a wood material board

2 spreading device

3a, 3b, 3c scattering station

4 conveyor belt

5 wrong bulk material container

6-press continuous double-belt press

7 separating device, saw station

8 balance

9.1, 9.2 measuring station

10 Cooling and/or curing store

11.1, 11.2 data storage

12 central computer

13.1, 13.2, 13.3 control circuit

14.1, 14.2 data line

15 finishing station, grinding installation

16 sign station

17 warehouse

Claims

1. Method for manufacturing boards of wood material, in which method the boards of wood material are passed through the following stations:

-a dispensing device (2) with adjustable metering for supplying wood material onto a conveyor belt (4) to form a mat of wood material;

-at least one continuous or discontinuous press (6) for pressing the mat of solid wooden material by means of pressure loading;

-at least one separating device (7) for separating the compacted mat of wooden material into individual, one-by-one boards;

-a measuring station (9.1) for determining plate geometry data;

-a cooling or curing warehouse (10) in which the boards are stored under pre-established atmospheric conditions until they are transported towards a final processing station (15) or a delivery point,

Characterized in that the plate geometry is measured at least once more after the curing process in the cooling or curing silo (10), and the setting values for the metering-adjustable distribution device (2) and/or the setting of the press (6) and/or the setting of the separating device (7) are determined and set by means of the difference in the measured values.

2. Method according to claim 1, characterized in that the measured data measured before and after cooling or curing storage are stored in at least one data memory (11.1, 11.2) and compared and analyzed by a central computer (12).

3. Method according to claim 2, characterized in that the central computer (12) is also provided with parameters, namely product type and/or storage time in the cooling and/or curing warehouse (10) and/or ambient temperature and air humidity.

4. A method according to claim 2 or 3, characterized in that the relation to the production parameters is taken into account in the central computer (12).

5. The method of claim 4, wherein the production parameter is ambient temperature or air humidity.

6. a method according to claim 2 or 3, characterised in that the adjustment values are transmitted by the central computer (12) to the spreading device (2) or to the press (6) or to the separating device (7).

7. A method according to any one of claims 1 to 3, wherein the tags are supplied to boards in a cooling or curing warehouse.

8. A method according to any one of claims 1 to 3, wherein the thickness is measured at the same location on the board before and after cooling or curing storage.

9. Method according to one of claims 1 to 3, characterized in that each plate is placed in a predefined measurement grid in both measurements.

10. a method according to one of claims 1 to 3, characterized in that the plates supplied to the cooling or curing warehouse (10) are allocated to the corresponding mat sections in the preceding production process.

11. Method according to one of claims 1 to 3, characterized in that a characteristic curve of the regulating parameter is created for each specification and/or each product on the basis of the difference measurement.

12. Apparatus for manufacturing boards of wood material, comprising:

-a measuring station (9.1) for determining plate geometry data;

Characterized in that the measuring station (9.1) or another measuring station (9.2) measures the plate geometry at least once more after the curing process in the cooling or curing warehouse (10), and the central computer (12) determines and sets the regulating values for the metering-adjustable spreading device (2) and/or the setting of the press (6) and/or the setting of the separating device (7) by means of the difference in the measured values.

13. The apparatus according to claim 12, characterized in that the measured data measured before and after cooling or curing storage are stored in at least one data memory (11.1, 11.2) and compared and analyzed by the central computer (12).

14. The plant according to claim 12 or 13, characterized in that the central computer (12) is also provided with parameters, namely product type and/or storage time in the cooling and/or curing warehouse (10) and/or ambient temperature and air humidity.

15. the apparatus according to claim 12 or 13, characterized in that the relation to the production parameters is taken into account in the central computer (12).

16. The apparatus of claim 15, wherein the production parameter is ambient temperature or air humidity.

17. The apparatus according to claim 12 or 13, characterized in that the adjustment values are transmitted by the central computer (12) to the spreading device (2) or to the press (6) or to the separating device (7).

18. Apparatus according to claim 12 or 13, characterized in that an identification station (16) is provided after the separating device (7) for identifying the boards supplied to the cooling or curing store.

19. The apparatus according to claim 12 or 13, characterised in that the measuring station (9.1) or another measuring station (9.2) measures the thickness of the board at the same location on the board before and after cooling or curing storage.

20. Device according to claim 12 or 13, characterized in that each plate is placed in a predefined measurement grid in both measurements.

21. The plant according to claim 12 or 13, characterized in that the plates supplied to the cooling or maturation warehouse (10) are allocated to the corresponding mat sections in the preceding production process.

22. The device according to claim 12 or 13, characterized in that the central computer (12) creates a characteristic curve of the adjustment parameter for each specification and/or for each product on the basis of the difference measurement.